Mercurial > hg > Feedworm

annotate backend/couchdb/CouchDbBackend.py @ 176:7001070d0bd5

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clean code
author dirk
date Fri, 09 Sep 2011 18:19:01 +0200
parents 57e324fa4350
children a4832a180c69
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1
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2 from FeedUpdater import FeedUpdater
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3 from Preferences import Preferences
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4 from backend.AbstractBackend import AbstractBackend
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5 from backend.couchdb import CouchDb
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6 from backend.couchdb.Feed import Feed
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7 from backend.couchdb.FeedEntry import FeedEntry
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8 import couchdb
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9 import logging
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11 class CouchDbBackend(AbstractBackend):
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12 '''
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13 Backend that uses CouchDB for persistence
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14 '''
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16 def __init__(self):
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17 CouchDb.init()
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18 server = couchdb.Server()
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19 self.database = server[CouchDb.database]
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20 self.prefs = None
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22 def preferences(self):
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23 if self.prefs is None:
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24 self.prefs = Preferences(self.database)
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25 return self.prefs
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27 #
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28 # handling of feeds
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29 #
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31 def getFeeds(self):
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32 if self.preferences().showOnlyUnreadFeeds():
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33 self.feeds = self._getUnreadFeeds()
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34 else:
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35 # make sure that the results are actually fetched into memory, otherwise we'll pass
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36 # a ViewResults instance around which is not what we want
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37 self.feeds = list(Feed.all(self.database))
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38 return self.feeds
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40 def _getUnreadFeeds(self):
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41 viewResults = self.database.view(CouchDb.feedsWithUnreadEntries(), group=True)
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42 feedsWithUnreadEntries = []
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43 for row in viewResults:
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44 feed = Feed.load(self.database, row["key"])
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45 feedsWithUnreadEntries.append(feed)
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46 return feedsWithUnreadEntries
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48 def _retrieveEntriesForSelectedFeed(self, hideReadEntries):
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49 # TODO how to hide read entries if requested?
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50 viewResults = FeedEntry.view(self.database, CouchDb.feedEntriesByFeed(),
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51 key=self.selectedFeed.id)
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52 return list(viewResults)
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54 def markSelectedFeedAsRead(self):
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55 for feedEntry in self.entriesForSelectedFeed():
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56 feedEntry.markRead(self.database)
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58 #
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59 # handling of the selected feed entry
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60 #
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62 def _markSelectedFeedEntryRead(self):
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63 self.selectedFeedEntry.markRead(self.database)
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65 def toggleSelectedFeedEntryRead(self):
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66 self.selectedFeedEntry.toggleRead(self.database)
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69 def toggleRead(self, feedEntry):
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70 raise Exception("not yet implemented")
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72 def markAllEntriesRead(self, feed):
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73 raise Exception("not yet implemented")
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75 def createFeed(self, url):
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76 feed = Feed.create(url)
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77 feed.store(self.database)
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78 FeedUpdater(self.database, self.preferences()).update(feed)
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80 def updateFeed(self, feed, changes):
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81 for key in changes.keys():
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82 feed[key] = changes[key]
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83 feed.store(self.database)
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84
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85 def deleteSelectedFeed(self):
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86 viewResults = self.database.view(CouchDb.feedEntriesByFeed(), key=self.selectedFeed.id)
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87 for row in viewResults:
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88 del self.database[row.id]
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89 del self.database[self.selectedFeed.id]
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91 def entriesForFeed(self, feed, hideReadEntries):
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92 viewName = CouchDb.feedEntriesByFeed()
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93 if hideReadEntries:
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94 viewName = CouchDb.unreadFeedEntriesByFeed()
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95 return list(FeedEntry.view(self.database, viewName))
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97 def markFeedEntriesAsRead(self, indices):
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98 for index in indices:
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99 feedEntry = self.entriesForSelectedFeed()[index]
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100 feedEntry.markRead(self.database)
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102 def updateAllFeeds(self):
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103 # TODO use a view instead of iterating all feeds
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104 allFeeds = Feed.all(self.database)
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105 for feed in allFeeds:
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106 if feed.needsUpdate():
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107 FeedUpdater(self.database, self.preferences()).update(feed)
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109 def expireFeedEntries(self):
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110 logger = logging.getLogger("expiry")
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111 expireDate = self._calculateExpireDate()
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112 logger.info("expiring entries older than " + str(expireDate))
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113 for entry in FeedEntry.getReadFeedEntriesOlderThan(expireDate, self.database):
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114 del self.database[entry.id]